This test ensures that mandatory ligatures in Arabic are displayed. Three values for text-anchor are also tested; middle, start and end. This test uses platform fonts for rendering.
There are two subtests. The first requires an isolate lam-alef ligature and the second requires a right-joining lam-alef ligature.
The first subtest has the word for 'tools', آلات 0622: آ ARABIC LETTER ALEF WITH MADDA ABOVE 0644: ل ARABIC LETTER LAM 0627: ا ARABIC LETTER ALEF 062A: ت ARABIC LETTER TEH
The second subtest has the word for 'three', ثلاثة 062B: ث ARABIC LETTER THEH 0644: ل ARABIC LETTER LAM 0627: ا ARABIC LETTER ALEF 062B: ث ARABIC LETTER THEH 0629: ة ARABIC LETTER TEH MARBUTA
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The test is passed if the blue glyphs آ and ث touch the first vertical line. The second vertical line falls in middle of the brown glyphs inbetween آلا and ت and inbetween ثلا and ثة. The black glyphs ت and ة touch the last vertical line.